CVE-2024-42243

Summary

CVE-2024-42243: A vulnerability in the Linux kernel's mm/filemap subsystem has been resolved. The issue arises due to the inability of xarray to support arbitrary page cache sizes. This can result in a WARN_ON() statement being hit, causing instability on certain systems. To mitigate this issue, the MAX_PAGECACHE_ORDER has been adjusted to a value supported by xarray, and the use of PMD-sized page caches in specific paths has been avoided. The patches suggested by David Hildenbrand were implemented to address the vulnerability.

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